
#all{border:1px solid gray;
    width: 600px;
    margin:0 auto;
}
#top {
    background: #E8E8E8;
    height: 65px;
}
/*logo的位置及大小的设置*/
#logo{
    height: 40px;
    position: absolute;
    margin:12px 0 0 465px ;
}
/**top中的两个按钮的修饰*/
#top li{
    list-style-type:none;
    cursor:pointer;
    width: 200px;
    height: 50px;
    font-size: 18px;
    font-weight: 600;
    line-height: 50px;
    text-align: center;
}
#but1{
    position: absolute;
    margin:15px 0 0 15px ;
}
#but2{
    position: absolute;
    margin : 15px 0 0 230px ;
}

#but1,#but2{background: white; border:none;}
#but1:hover,#but2:hover{background: white; border:none;}



#mid{
    background: lightskyblue;
    height: 205px;}

#bot{
    background: lightyellow;
    height: 195px;
}



